NDLI: Experimental Studies of a Novel Alternating Flow (AF) Hydraulic Pump

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ryan, J. Foss Li, Mengtang Eric, J. Barth Kim, A. Stelson James, D. Van De Ven
Copyright Year	2017
Abstract	The ideal variable displacement pump for a displacement control circuit is efficient across a wide operating range and readily mounted on a common shaft with multiple pumps. This paper presents a novel variable displacement pump architecture for displacement control circuits that uses the concept of alternating flow (AF) between piston pairs that share a common cylinder. The displacement is adjusted by varying the phase angle between the piston pairs. When the pistons are in phase, the pump displacement is at a maximum and when the pairs of pistons are out of phase, fluid is shuttled between the pistons and the pump produces no net flow. A prototype of the AF pump was constructed from two inline triplex pumps that were modified so that three piston pairs were created. The crankshafts of the two pumps were connected via a sprocket-and-chain transmission. The sprockets allow for accurate measurement of the phase angle, which is adjusted, in this early phase prototype, by disassembling the chain and shifting the sprockets. The prototype AF pump was then mounted to the test stand and experiments were conducted to map the AF pump efficiency and cylinder pressure dynamics across a range of operating pressure, speed, and displacement. The AF pump’s efficiency was measured for 8 diferent phase angles with an efficiency of near 90% at full flow and 65% at 36% displacement. The experimental results were compared to simulation results, presented in a companion paper at this conference.
Sponsorship	Fluid Power Systems and Technology Division
File Format	PDF
ISBN	9780791858332
DOI	10.1115/FPMC2017-4315
Conference Proceedings	ASME/BATH 2017 Symposium on Fluid Power and Motion Control
Language	English
Publisher Date	2017-10-16
Publisher Place	Sarasota, Forida, USA
Access Restriction	Subscribed
Subject Keyword	Chain Circuits Flow (dynamics) Pressure Displacement Pistons Hydraulic pumps Fluids Simulation results Pumps Dynamics (mechanics) Engineering prototypes Cylinders
Content Type	Text
Resource Type	Article

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